Merge pull request #267 from philsogaDGI/7.x

modify manage permissions D7
Add check for PHP XSLT Processor extension.

When the PHP XSLT Processor extension is not loaded, Islandora will
silently fail when attempting to add new objects.  This changeset
adds a check in the Islandora hook_requirements() hook for the
XSLTProcessor class.  If it isn't found, a message is thrown.

Conflicts:

	islandora.install
Merge pull request #278 from nigelgbanks/7.x-class-check

Add check for PHP XSLT Processor extension.
Add mapping for dng extension.
Merge pull request #282 from adam-vessey/7.x

Add mapping for dng extension.
Prevent a recursion loop early.
Merge pull request #283 from adam-vessey/7.x

Prevent a recursion loop early.
Added two helper functions.

islandora_user_access_all()
islandora_user_access_any()

They simplify checking for multiple permissions, either requiring all
or only one permission.
Merge pull request #286 from nigelgbanks/7.x-access-helpers

Added two helper functions.
Added in the Fedora_ingest permission to show the manage tab